a little. put a secondary cat like 200 cel.... doesnt make much difference to have it off anyways... its just freakin loud without it... also since your in SOCAL... MXP with no cat and just all resonator... your car will be insanely loud... abnoxious...

EDIT: sounds like you only have a axle back MXP with OEM xpipe...

replacing it will make it worst... MUCH WORST... AND YOU WILL PROBABLY GET PULLED OVER AND OVER AND OVER... lol

Thanks guys. What about keeping the OEM cats. But just replacing OEM x pipe with after market quad resonated x pipe?

Still be worse? :/

the problem is not the xpipe its the exhaust....

this is the reason why i got the Akrapovic... even with no cats its not as crazy as other exhaust...

although there are other axle back exhaust that give less drone... but just an fyi.... most do have drone... the only one i can think of is the AKRA that give the least drone with or without xpipe... even a full GT4 xpipe...

the MXP is pretty mild but does have a slight boominess at 2000 rpm. It's not really a drone, since this exhaust is very quiet at freeway or cruising speeds. It's the low rpm bass that most aftermarket exhausts make.

If you don't like it, the Eisenmann Sport, the Corsa, or the Akrapovic are the exhausts I'd look at. You already have 2 sets of cats and 2 resonators, nothing aftermarket is going to be quieter. The Innotech is also very nice in this regard, because while open it drones like CRAZY, with the valves closed, it's very quiet.

Get a tune to get rid of the start up emissions cycle. It's what causes all that "drone" in the morning. It's pretty loud with the Akra too until the car warms up.

You could also get an exhaust shop to weld in some Heimholtz chambers for around $200 I'd it's really drone you hear while cruising that's bothering you.

__________________

Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."

I tried searching but I was hoping someone had a comparison of AA, MXP, and Vanguard rear section in terms of boom/drone.

Yes, just like the AA units. They don't have to be next to the cans. They can be anywhere along the exhaust path. AFE even has a small one on their N55 downpipe.

Is the boom you're talking about when the engine's cold or while cruising?

.

__________________

Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."

Get a tune to get rid of the start up emissions cycle. It's what causes all that "drone" in the morning. It's pretty loud with the Akra too until the car warms up.

You don't want to do this with the stock cats in place.

Quote:

Originally Posted by aus

You could also get an exhaust shop to weld in some Heimholtz chambers for around $200 I'd it's really drone you hear while cruising that's bothering you.

this won't help at all, with the 2000 rpm boominess. Remember, the MXP doesn't have any drone at all (it's very quiet under steady state throttle) it's the transient throttle at 2000 rpm that is a little apparent. I actually think the MXP is pretty good in this regard, compared to many others.

this won't help at all, with the 2000 rpm boominess. Remember, the MXP doesn't have any drone at all (it's very quiet under steady state throttle) it's the transient throttle at 2000 rpm that is a little apparent. I actually think the MXP is pretty good in this regard, compared to many others.

Nothing else is going to be quiet enough. (I haven't tried the Bastruck or Remus Sport, or supersprint, but I'm up to 23 other combinations of exhausts)

Why wouldn't you want to tune out the start up heat cycle even if you have the stock X-pipe?
And if you tune this out, it will help with the 2000 RPM boominess when the engine's cold. The Akra is damn loud when the engines cold, but fine once it warms up at 2000 RPM.

.

__________________

Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."

The mainly concern for me is like kitw said, the 2k rpm boom during shift and accel. Start up is definitely loud too. If that can be helped, it'd be an added bonus but primarily it's during driving the boom that bothers me.

The other quieter exhausts sound good but I think it's a little too quiet for me. Give and take relationship, I guess.

Sounds like maybe an option is to do a custom x pipe with the chambers? I don't want to modify MXP or stock parts.

Why wouldn't you want to tune out the start up heat cycle even if you have the stock X-pipe?
And if you tune this out, it will help with the 2000 RPM boominess when the engine's cold. The Akra is damn loud when the engines cold, but fine once it warms up at 2000 RPM.

.

You want the cats to heat up fast. They won't work and won't last as long if they don't.

The other quieter exhausts sound good but I think it's a little too quiet for me. Give and take relationship, I guess.

Get an Innotech. Close it when you are wanting to drive around quietly, open the valve when you want to rip around. You can't have it both ways... unless you go with an exhaust with a valve somewhere. (I haven't heard Evolve's system yet)